Move to kernel style SPDX license identifiers
[babeltrace.git] / src / plugins / utils / muxer / muxer.c
index 827532d93e05734e637ea0875fce08f5fc0c140a..182dc84d66d25ef781bee781020900040150282e 100644 (file)
@@ -1,36 +1,17 @@
 /*
- * Copyright 2017 Philippe Proulx <pproulx@efficios.com>
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
+ * SPDX-License-Identifier: MIT
  *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
- * SOFTWARE.
+ * Copyright 2017 Philippe Proulx <pproulx@efficios.com>
  */
 
-#define BT_LOG_TAG "PLUGIN-UTILS-MUXER-FLT"
-#include "logging.h"
+#define BT_COMP_LOG_SELF_COMP (muxer_comp->self_comp)
+#define BT_LOG_OUTPUT_LEVEL (muxer_comp->log_level)
+#define BT_LOG_TAG "PLUGIN/FLT.UTILS.MUXER"
+#include "logging/comp-logging.h"
 
 #include "common/macros.h"
-#include "compat/uuid.h"
+#include "common/uuid.h"
 #include <babeltrace2/babeltrace.h>
-#include "lib/value.h"
-#include "lib/graph/component.h"
-#include "lib/graph/message/iterator.h"
-#include "lib/graph/connection.h"
-#include "plugins/plugins-common.h"
 #include <glib.h>
 #include <stdbool.h>
 #include <inttypes.h>
 #include <stdlib.h>
 #include <string.h>
 
-#include "muxer.h"
+#include "plugins/common/muxing/muxing.h"
+#include "plugins/common/param-validation/param-validation.h"
 
-#define ASSUME_ABSOLUTE_CLOCK_CLASSES_PARAM_NAME       "assume-absolute-clock-classes"
+#include "muxer.h"
 
 struct muxer_comp {
-       /* Weak ref */
-       bt_self_component_filter *self_comp;
+       /* Weak refs */
+       bt_self_component_filter *self_comp_flt;
+       bt_self_component *self_comp;
 
        unsigned int next_port_num;
        size_t available_input_ports;
        bool initializing_muxer_msg_iter;
-       bool assume_absolute_clock_classes;
+       bt_logging_level log_level;
 };
 
 struct muxer_upstream_msg_iter {
+       struct muxer_comp *muxer_comp;
+
        /* Owned by this, NULL if ended */
-       bt_self_component_port_input_message_iterator *msg_iter;
+       bt_message_iterator *msg_iter;
 
        /* Contains `const bt_message *`, owned by this */
        GQueue *msgs;
@@ -70,6 +55,11 @@ enum muxer_msg_iter_clock_class_expectation {
 };
 
 struct muxer_msg_iter {
+       struct muxer_comp *muxer_comp;
+
+       /* Weak */
+       bt_self_message_iterator *self_msg_iter;
+
        /*
         * Array of struct muxer_upstream_msg_iter * (owned by this).
         *
@@ -100,7 +90,15 @@ struct muxer_msg_iter {
         * clock_class_expectation is
         * MUXER_MSG_ITER_CLOCK_CLASS_EXPECTATION_NOT_ABS_SPEC_UUID.
         */
-       unsigned char expected_clock_class_uuid[BABELTRACE_UUID_LEN];
+       bt_uuid_t expected_clock_class_uuid;
+
+       /*
+        * Saved error.  If we hit an error in the _next method, but have some
+        * messages ready to return, we save the error here and return it on
+        * the next _next call.
+        */
+       bt_message_iterator_class_next_method_status next_saved_status;
+       const struct bt_error *next_saved_error;
 };
 
 static
@@ -117,16 +115,19 @@ static
 void destroy_muxer_upstream_msg_iter(
                struct muxer_upstream_msg_iter *muxer_upstream_msg_iter)
 {
+       struct muxer_comp *muxer_comp;
+
        if (!muxer_upstream_msg_iter) {
                return;
        }
 
-       BT_LOGD("Destroying muxer's upstream message iterator wrapper: "
+       muxer_comp = muxer_upstream_msg_iter->muxer_comp;
+       BT_COMP_LOGD("Destroying muxer's upstream message iterator wrapper: "
                "addr=%p, msg-iter-addr=%p, queue-len=%u",
                muxer_upstream_msg_iter,
                muxer_upstream_msg_iter->msg_iter,
                muxer_upstream_msg_iter->msgs->length);
-       bt_self_component_port_input_message_iterator_put_ref(
+       bt_message_iterator_put_ref(
                muxer_upstream_msg_iter->msg_iter);
 
        if (muxer_upstream_msg_iter->msgs) {
@@ -139,28 +140,30 @@ void destroy_muxer_upstream_msg_iter(
 
 static
 int muxer_msg_iter_add_upstream_msg_iter(struct muxer_msg_iter *muxer_msg_iter,
-               bt_self_component_port_input_message_iterator *self_msg_iter)
+               bt_message_iterator *self_msg_iter)
 {
        int ret = 0;
        struct muxer_upstream_msg_iter *muxer_upstream_msg_iter =
                g_new0(struct muxer_upstream_msg_iter, 1);
+       struct muxer_comp *muxer_comp = muxer_msg_iter->muxer_comp;
 
        if (!muxer_upstream_msg_iter) {
-               BT_LOGE_STR("Failed to allocate one muxer's upstream message iterator wrapper.");
+               BT_COMP_LOGE_STR("Failed to allocate one muxer's upstream message iterator wrapper.");
                goto error;
        }
 
+       muxer_upstream_msg_iter->muxer_comp = muxer_comp;
        muxer_upstream_msg_iter->msg_iter = self_msg_iter;
-       bt_self_component_port_input_message_iterator_get_ref(muxer_upstream_msg_iter->msg_iter);
+       bt_message_iterator_get_ref(muxer_upstream_msg_iter->msg_iter);
        muxer_upstream_msg_iter->msgs = g_queue_new();
        if (!muxer_upstream_msg_iter->msgs) {
-               BT_LOGE_STR("Failed to allocate a GQueue.");
+               BT_COMP_LOGE_STR("Failed to allocate a GQueue.");
                goto error;
        }
 
        g_ptr_array_add(muxer_msg_iter->active_muxer_upstream_msg_iters,
                muxer_upstream_msg_iter);
-       BT_LOGD("Added muxer's upstream message iterator wrapper: "
+       BT_COMP_LOGD("Added muxer's upstream message iterator wrapper: "
                "addr=%p, muxer-msg-iter-addr=%p, msg-iter-addr=%p",
                muxer_upstream_msg_iter, muxer_msg_iter,
                self_msg_iter);
@@ -176,36 +179,37 @@ end:
 }
 
 static
-bt_self_component_status add_available_input_port(
+bt_self_component_add_port_status add_available_input_port(
                bt_self_component_filter *self_comp)
 {
        struct muxer_comp *muxer_comp = bt_self_component_get_data(
                bt_self_component_filter_as_self_component(self_comp));
-       bt_self_component_status status = BT_SELF_COMPONENT_STATUS_OK;
+       bt_self_component_add_port_status status =
+               BT_SELF_COMPONENT_ADD_PORT_STATUS_OK;
        GString *port_name = NULL;
 
        BT_ASSERT(muxer_comp);
        port_name = g_string_new("in");
        if (!port_name) {
-               BT_LOGE_STR("Failed to allocate a GString.");
-               status = BT_SELF_COMPONENT_STATUS_NOMEM;
+               BT_COMP_LOGE_STR("Failed to allocate a GString.");
+               status = BT_SELF_COMPONENT_ADD_PORT_STATUS_MEMORY_ERROR;
                goto end;
        }
 
        g_string_append_printf(port_name, "%u", muxer_comp->next_port_num);
        status = bt_self_component_filter_add_input_port(
                self_comp, port_name->str, NULL, NULL);
-       if (status != BT_SELF_COMPONENT_STATUS_OK) {
-               BT_LOGE("Cannot add input port to muxer component: "
+       if (status != BT_SELF_COMPONENT_ADD_PORT_STATUS_OK) {
+               BT_COMP_LOGE("Cannot add input port to muxer component: "
                        "port-name=\"%s\", comp-addr=%p, status=%s",
                        port_name->str, self_comp,
-                       bt_self_component_status_string(status));
+                       bt_common_func_status_string(status));
                goto end;
        }
 
        muxer_comp->available_input_ports++;
        muxer_comp->next_port_num++;
-       BT_LOGD("Added one input port to muxer component: "
+       BT_COMP_LOGI("Added one input port to muxer component: "
                "port-name=\"%s\", comp-addr=%p",
                port_name->str, self_comp);
 
@@ -218,7 +222,7 @@ end:
 }
 
 static
-bt_self_component_status create_output_port(
+bt_self_component_add_port_status create_output_port(
                bt_self_component_filter *self_comp)
 {
        return bt_self_component_filter_add_output_port(
@@ -236,151 +240,86 @@ void destroy_muxer_comp(struct muxer_comp *muxer_comp)
 }
 
 static
-bt_value *get_default_params(void)
-{
-       bt_value *params;
-       int ret;
-
-       params = bt_value_map_create();
-       if (!params) {
-               BT_LOGE_STR("Cannot create a map value object.");
-               goto error;
-       }
-
-       ret = bt_value_map_insert_bool_entry(params,
-               ASSUME_ABSOLUTE_CLOCK_CLASSES_PARAM_NAME, false);
-       if (ret) {
-               BT_LOGE_STR("Cannot add boolean value to map value object.");
-               goto error;
-       }
-
-       goto end;
-
-error:
-       BT_VALUE_PUT_REF_AND_RESET(params);
-
-end:
-       return params;
-}
-
-static
-int configure_muxer_comp(struct muxer_comp *muxer_comp,
-               const bt_value *params)
-{
-       bt_value *default_params = NULL;
-       bt_value *real_params = NULL;
-       const bt_value *assume_absolute_clock_classes = NULL;
-       int ret = 0;
-       bt_bool bool_val;
-
-       default_params = get_default_params();
-       if (!default_params) {
-               BT_LOGE("Cannot get default parameters: "
-                       "muxer-comp-addr=%p", muxer_comp);
-               goto error;
-       }
-
-       ret = bt_value_map_extend(default_params, params, &real_params);
-       if (ret) {
-               BT_LOGE("Cannot extend default parameters map value: "
-                       "muxer-comp-addr=%p, def-params-addr=%p, "
-                       "params-addr=%p", muxer_comp, default_params,
-                       params);
-               goto error;
-       }
-
-       assume_absolute_clock_classes = bt_value_map_borrow_entry_value(real_params,
-                                                                       ASSUME_ABSOLUTE_CLOCK_CLASSES_PARAM_NAME);
-       if (assume_absolute_clock_classes &&
-                       !bt_value_is_bool(assume_absolute_clock_classes)) {
-               BT_LOGE("Expecting a boolean value for the `%s` parameter: "
-                       "muxer-comp-addr=%p, value-type=%s",
-                       ASSUME_ABSOLUTE_CLOCK_CLASSES_PARAM_NAME, muxer_comp,
-                       bt_common_value_type_string(
-                               bt_value_get_type(assume_absolute_clock_classes)));
-               goto error;
-       }
-
-       bool_val = bt_value_bool_get(assume_absolute_clock_classes);
-       muxer_comp->assume_absolute_clock_classes = (bool) bool_val;
-       BT_LOGD("Configured muxer component: muxer-comp-addr=%p, "
-               "assume-absolute-clock-classes=%d",
-               muxer_comp, muxer_comp->assume_absolute_clock_classes);
-       goto end;
-
-error:
-       ret = -1;
-
-end:
-       bt_value_put_ref(default_params);
-       bt_value_put_ref(real_params);
-       return ret;
-}
+struct bt_param_validation_map_value_entry_descr muxer_params[] = {
+       BT_PARAM_VALIDATION_MAP_VALUE_ENTRY_END
+};
 
 BT_HIDDEN
-bt_self_component_status muxer_init(
-               bt_self_component_filter *self_comp,
+bt_component_class_initialize_method_status muxer_init(
+               bt_self_component_filter *self_comp_flt,
+               bt_self_component_filter_configuration *config,
                const bt_value *params, void *init_data)
 {
-       int ret;
-       bt_self_component_status status = BT_SELF_COMPONENT_STATUS_OK;
+       bt_component_class_initialize_method_status status;
+       bt_self_component_add_port_status add_port_status;
+       bt_self_component *self_comp =
+               bt_self_component_filter_as_self_component(self_comp_flt);
        struct muxer_comp *muxer_comp = g_new0(struct muxer_comp, 1);
+       bt_logging_level log_level = bt_component_get_logging_level(
+               bt_self_component_as_component(self_comp));
+       enum bt_param_validation_status validation_status;
+       gchar *validate_error = NULL;
 
-       BT_LOGD("Initializing muxer component: "
+       BT_COMP_LOG_CUR_LVL(BT_LOG_INFO, log_level, self_comp,
+               "Initializing muxer component: "
                "comp-addr=%p, params-addr=%p", self_comp, params);
 
        if (!muxer_comp) {
-               BT_LOGE_STR("Failed to allocate one muxer component.");
+               BT_COMP_LOG_CUR_LVL(BT_LOG_ERROR, log_level, self_comp,
+                       "Failed to allocate one muxer component.");
+               status = BT_COMPONENT_CLASS_INITIALIZE_METHOD_STATUS_MEMORY_ERROR;
                goto error;
        }
 
-       ret = configure_muxer_comp(muxer_comp, params);
-       if (ret) {
-               BT_LOGE("Cannot configure muxer component: "
-                       "muxer-comp-addr=%p, params-addr=%p",
-                       muxer_comp, params);
+       muxer_comp->log_level = log_level;
+       muxer_comp->self_comp = self_comp;
+       muxer_comp->self_comp_flt = self_comp_flt;
+
+       validation_status = bt_param_validation_validate(params,
+               muxer_params, &validate_error);
+       if (validation_status == BT_PARAM_VALIDATION_STATUS_MEMORY_ERROR) {
+               status = BT_COMPONENT_CLASS_INITIALIZE_METHOD_STATUS_MEMORY_ERROR;
+               goto error;
+       } else if (validation_status == BT_PARAM_VALIDATION_STATUS_VALIDATION_ERROR) {
+               status = BT_COMPONENT_CLASS_INITIALIZE_METHOD_STATUS_ERROR;
+               BT_COMP_LOGE_APPEND_CAUSE(self_comp, "%s", validate_error);
                goto error;
        }
 
-       muxer_comp->self_comp = self_comp;
-       bt_self_component_set_data(
-               bt_self_component_filter_as_self_component(self_comp),
-               muxer_comp);
-       status = add_available_input_port(self_comp);
-       if (status != BT_SELF_COMPONENT_STATUS_OK) {
-               BT_LOGE("Cannot ensure that at least one muxer component's input port is available: "
+       bt_self_component_set_data(self_comp, muxer_comp);
+       add_port_status = add_available_input_port(self_comp_flt);
+       if (add_port_status != BT_SELF_COMPONENT_ADD_PORT_STATUS_OK) {
+               BT_COMP_LOGE("Cannot ensure that at least one muxer component's input port is available: "
                        "muxer-comp-addr=%p, status=%s",
                        muxer_comp,
-                       bt_self_component_status_string(status));
+                       bt_common_func_status_string(add_port_status));
+               status = (int) add_port_status;
                goto error;
        }
 
-       status = create_output_port(self_comp);
-       if (status) {
-               BT_LOGE("Cannot create muxer component's output port: "
+       add_port_status = create_output_port(self_comp_flt);
+       if (add_port_status != BT_SELF_COMPONENT_ADD_PORT_STATUS_OK) {
+               BT_COMP_LOGE("Cannot create muxer component's output port: "
                        "muxer-comp-addr=%p, status=%s",
                        muxer_comp,
-                       bt_self_component_status_string(status));
+                       bt_common_func_status_string(add_port_status));
+               status = (int) add_port_status;
                goto error;
        }
 
-       BT_LOGD("Initialized muxer component: "
+       BT_COMP_LOGI("Initialized muxer component: "
                "comp-addr=%p, params-addr=%p, muxer-comp-addr=%p",
                self_comp, params, muxer_comp);
 
+       status = BT_COMPONENT_CLASS_INITIALIZE_METHOD_STATUS_OK;
        goto end;
 
 error:
        destroy_muxer_comp(muxer_comp);
-       bt_self_component_set_data(
-               bt_self_component_filter_as_self_component(self_comp),
-               NULL);
-
-       if (status == BT_SELF_COMPONENT_STATUS_OK) {
-               status = BT_SELF_COMPONENT_STATUS_ERROR;
-       }
+       bt_self_component_set_data(self_comp, NULL);
 
 end:
+       g_free(validate_error);
        return status;
 }
 
@@ -390,20 +329,23 @@ void muxer_finalize(bt_self_component_filter *self_comp)
        struct muxer_comp *muxer_comp = bt_self_component_get_data(
                bt_self_component_filter_as_self_component(self_comp));
 
-       BT_LOGD("Finalizing muxer component: comp-addr=%p",
+       BT_COMP_LOGI("Finalizing muxer component: comp-addr=%p",
                self_comp);
        destroy_muxer_comp(muxer_comp);
 }
 
 static
-bt_self_component_port_input_message_iterator *
-create_msg_iter_on_input_port(bt_self_component_port_input *self_port)
+bt_message_iterator_create_from_message_iterator_status
+create_msg_iter_on_input_port(struct muxer_comp *muxer_comp,
+               struct muxer_msg_iter *muxer_msg_iter,
+               bt_self_component_port_input *self_port,
+               bt_message_iterator **msg_iter)
 {
        const bt_port *port = bt_self_component_port_as_port(
                bt_self_component_port_input_as_self_component_port(
                        self_port));
-       bt_self_component_port_input_message_iterator *msg_iter =
-               NULL;
+       bt_message_iterator_create_from_message_iterator_status
+               status;
 
        BT_ASSERT(port);
        BT_ASSERT(bt_port_is_connected(port));
@@ -411,51 +353,53 @@ create_msg_iter_on_input_port(bt_self_component_port_input *self_port)
        // TODO: Advance the iterator to >= the time of the latest
        //       returned message by the muxer message
        //       iterator which creates it.
-       msg_iter = bt_self_component_port_input_message_iterator_create(
-               self_port);
-       if (!msg_iter) {
-               BT_LOGE("Cannot create upstream message iterator on input port: "
+       status = bt_message_iterator_create_from_message_iterator(
+               muxer_msg_iter->self_msg_iter, self_port, msg_iter);
+       if (status != BT_MESSAGE_ITERATOR_CREATE_FROM_MESSAGE_ITERATOR_STATUS_OK) {
+               BT_COMP_LOGE("Cannot create upstream message iterator on input port: "
                        "port-addr=%p, port-name=\"%s\"",
                        port, bt_port_get_name(port));
                goto end;
        }
 
-       BT_LOGD("Created upstream message iterator on input port: "
+       BT_COMP_LOGI("Created upstream message iterator on input port: "
                "port-addr=%p, port-name=\"%s\", msg-iter-addr=%p",
                port, bt_port_get_name(port), msg_iter);
 
 end:
-       return msg_iter;
+       return status;
 }
 
 static
-bt_self_message_iterator_status muxer_upstream_msg_iter_next(
+bt_message_iterator_class_next_method_status muxer_upstream_msg_iter_next(
                struct muxer_upstream_msg_iter *muxer_upstream_msg_iter,
                bool *is_ended)
 {
-       bt_self_message_iterator_status status;
-       bt_message_iterator_status input_port_iter_status;
+       struct muxer_comp *muxer_comp = muxer_upstream_msg_iter->muxer_comp;
+       bt_message_iterator_class_next_method_status status;
+       bt_message_iterator_next_status input_port_iter_status;
        bt_message_array_const msgs;
        uint64_t i;
        uint64_t count;
 
-       BT_LOGV("Calling upstream message iterator's \"next\" method: "
+       BT_COMP_LOGD("Calling upstream message iterator's \"next\" method: "
                "muxer-upstream-msg-iter-wrap-addr=%p, msg-iter-addr=%p",
                muxer_upstream_msg_iter,
                muxer_upstream_msg_iter->msg_iter);
-       input_port_iter_status = bt_self_component_port_input_message_iterator_next(
+       input_port_iter_status = bt_message_iterator_next(
                muxer_upstream_msg_iter->msg_iter, &msgs, &count);
-       BT_LOGV("Upstream message iterator's \"next\" method returned: "
-               "status=%s", bt_message_iterator_status_string(input_port_iter_status));
+       BT_COMP_LOGD("Upstream message iterator's \"next\" method returned: "
+               "status=%s",
+               bt_common_func_status_string(input_port_iter_status));
 
        switch (input_port_iter_status) {
-       case BT_MESSAGE_ITERATOR_STATUS_OK:
+       case BT_MESSAGE_ITERATOR_NEXT_STATUS_OK:
                /*
                 * Message iterator's current message is
                 * valid: it must be considered for muxing operations.
                 */
-               BT_LOGV_STR("Validated upstream message iterator wrapper.");
-               BT_ASSERT(count > 0);
+               BT_COMP_LOGD_STR("Validated upstream message iterator wrapper.");
+               BT_ASSERT_DBG(count > 0);
 
                /* Move messages to our queue */
                for (i = 0; i < count; i++) {
@@ -467,30 +411,39 @@ bt_self_message_iterator_status muxer_upstream_msg_iter_next(
                        g_queue_push_tail(muxer_upstream_msg_iter->msgs,
                                (void *) msgs[i]);
                }
-               status = BT_SELF_MESSAGE_ITERATOR_STATUS_OK;
+               status = BT_MESSAGE_ITERATOR_CLASS_NEXT_METHOD_STATUS_OK;
                break;
-       case BT_MESSAGE_ITERATOR_STATUS_AGAIN:
+       case BT_MESSAGE_ITERATOR_NEXT_STATUS_AGAIN:
                /*
                 * Message iterator's current message is not
                 * valid anymore. Return
-                * BT_MESSAGE_ITERATOR_STATUS_AGAIN immediately.
+                * BT_MESSAGE_ITERATOR_NEXT_STATUS_AGAIN immediately.
                 */
-               status = BT_SELF_MESSAGE_ITERATOR_STATUS_AGAIN;
+               status = BT_MESSAGE_ITERATOR_CLASS_NEXT_METHOD_STATUS_AGAIN;
                break;
-       case BT_MESSAGE_ITERATOR_STATUS_END:    /* Fall-through. */
+       case BT_MESSAGE_ITERATOR_NEXT_STATUS_END:       /* Fall-through. */
                /*
                 * Message iterator reached the end: release it. It
                 * won't be considered again to find the youngest
                 * message.
                 */
                *is_ended = true;
-               status = BT_SELF_MESSAGE_ITERATOR_STATUS_OK;
+               status = BT_MESSAGE_ITERATOR_CLASS_NEXT_METHOD_STATUS_OK;
+               break;
+       case BT_MESSAGE_ITERATOR_NEXT_STATUS_ERROR:
+       case BT_MESSAGE_ITERATOR_NEXT_STATUS_MEMORY_ERROR:
+               /* Error status code */
+               BT_COMP_LOGE_APPEND_CAUSE(muxer_comp->self_comp,
+                       "Upstream iterator's next method returned an error: status=%s",
+                       bt_common_func_status_string(input_port_iter_status));
+               status = (int) input_port_iter_status;
                break;
        default:
-               /* Error or unsupported status code */
-               BT_LOGE("Error or unsupported status code: "
-                       "status-code=%d", input_port_iter_status);
-               status = BT_SELF_MESSAGE_ITERATOR_STATUS_ERROR;
+               /* Unsupported status code */
+               BT_COMP_LOGE_APPEND_CAUSE(muxer_comp->self_comp,
+                       "Unsupported status code: status=%s",
+                       bt_common_func_status_string(input_port_iter_status));
+               status = BT_MESSAGE_ITERATOR_CLASS_NEXT_METHOD_STATUS_ERROR;
                break;
        }
 
@@ -505,13 +458,12 @@ int get_msg_ts_ns(struct muxer_comp *muxer_comp,
 {
        const bt_clock_snapshot *clock_snapshot = NULL;
        int ret = 0;
-       bt_message_stream_activity_clock_snapshot_state sa_cs_state;
        const bt_stream_class *stream_class = NULL;
        bt_message_type msg_type;
 
-       BT_ASSERT(msg);
-       BT_ASSERT(ts_ns);
-       BT_LOGV("Getting message's timestamp: "
+       BT_ASSERT_DBG(msg);
+       BT_ASSERT_DBG(ts_ns);
+       BT_COMP_LOGD("Getting message's timestamp: "
                "muxer-msg-iter-addr=%p, msg-addr=%p, "
                "last-returned-ts=%" PRId64,
                muxer_msg_iter, msg, last_returned_ts_ns);
@@ -544,7 +496,7 @@ int get_msg_ts_ns(struct muxer_comp *muxer_comp,
 
        switch (msg_type) {
        case BT_MESSAGE_TYPE_EVENT:
-               BT_ASSERT(bt_message_event_borrow_stream_class_default_clock_class_const(
+               BT_ASSERT_DBG(bt_message_event_borrow_stream_class_default_clock_class_const(
                                msg));
                clock_snapshot = bt_message_event_borrow_default_clock_snapshot_const(
                        msg);
@@ -569,6 +521,28 @@ int get_msg_ts_ns(struct muxer_comp *muxer_comp,
                }
 
                break;
+       case BT_MESSAGE_TYPE_STREAM_BEGINNING:
+       {
+               enum bt_message_stream_clock_snapshot_state snapshot_state =
+                       bt_message_stream_beginning_borrow_default_clock_snapshot_const(
+                               msg, &clock_snapshot);
+               if (snapshot_state == BT_MESSAGE_STREAM_CLOCK_SNAPSHOT_STATE_UNKNOWN) {
+                       goto no_clock_snapshot;
+               }
+
+               break;
+       }
+       case BT_MESSAGE_TYPE_STREAM_END:
+       {
+               enum bt_message_stream_clock_snapshot_state snapshot_state =
+                       bt_message_stream_end_borrow_default_clock_snapshot_const(
+                               msg, &clock_snapshot);
+               if (snapshot_state == BT_MESSAGE_STREAM_CLOCK_SNAPSHOT_STATE_UNKNOWN) {
+                       goto no_clock_snapshot;
+               }
+
+               break;
+       }
        case BT_MESSAGE_TYPE_DISCARDED_EVENTS:
                if (bt_stream_class_discarded_events_have_default_clock_snapshots(
                                stream_class)) {
@@ -588,41 +562,21 @@ int get_msg_ts_ns(struct muxer_comp *muxer_comp,
                        goto no_clock_snapshot;
                }
 
-               break;
-       case BT_MESSAGE_TYPE_STREAM_ACTIVITY_BEGINNING:
-               BT_ASSERT(bt_message_stream_activity_beginning_borrow_stream_class_default_clock_class_const(
-                               msg));
-               sa_cs_state = bt_message_stream_activity_beginning_borrow_default_clock_snapshot_const(
-                       msg, &clock_snapshot);
-               if (sa_cs_state != BT_MESSAGE_STREAM_ACTIVITY_CLOCK_SNAPSHOT_STATE_KNOWN) {
-                       goto no_clock_snapshot;
-               }
-
-               break;
-       case BT_MESSAGE_TYPE_STREAM_ACTIVITY_END:
-               BT_ASSERT(bt_message_stream_activity_end_borrow_stream_class_default_clock_class_const(
-                               msg));
-               sa_cs_state = bt_message_stream_activity_end_borrow_default_clock_snapshot_const(
-                       msg, &clock_snapshot);
-               if (sa_cs_state != BT_MESSAGE_STREAM_ACTIVITY_CLOCK_SNAPSHOT_STATE_KNOWN) {
-                       goto no_clock_snapshot;
-               }
-
                break;
        case BT_MESSAGE_TYPE_MESSAGE_ITERATOR_INACTIVITY:
-               clock_snapshot = bt_message_message_iterator_inactivity_borrow_default_clock_snapshot_const(
+               clock_snapshot = bt_message_message_iterator_inactivity_borrow_clock_snapshot_const(
                        msg);
                break;
        default:
                /* All the other messages have a higher priority */
-               BT_LOGV_STR("Message has no timestamp: using the last returned timestamp.");
+               BT_COMP_LOGD_STR("Message has no timestamp: using the last returned timestamp.");
                *ts_ns = last_returned_ts_ns;
                goto end;
        }
 
        ret = bt_clock_snapshot_get_ns_from_origin(clock_snapshot, ts_ns);
        if (ret) {
-               BT_LOGE("Cannot get nanoseconds from Epoch of clock snapshot: "
+               BT_COMP_LOGE("Cannot get nanoseconds from Epoch of clock snapshot: "
                        "clock-snapshot-addr=%p", clock_snapshot);
                goto error;
        }
@@ -630,7 +584,7 @@ int get_msg_ts_ns(struct muxer_comp *muxer_comp,
        goto end;
 
 no_clock_snapshot:
-       BT_LOGV_STR("Message's default clock snapshot is missing: "
+       BT_COMP_LOGD_STR("Message's default clock snapshot is missing: "
                "using the last returned timestamp.");
        *ts_ns = last_returned_ts_ns;
        goto end;
@@ -640,7 +594,7 @@ error:
 
 end:
        if (ret == 0) {
-               BT_LOGV("Found message's timestamp: "
+               BT_COMP_LOGD("Found message's timestamp: "
                        "muxer-msg-iter-addr=%p, msg-addr=%p, "
                        "last-returned-ts=%" PRId64 ", ts=%" PRId64,
                        muxer_msg_iter, msg, last_returned_ts_ns,
@@ -656,21 +610,19 @@ int validate_clock_class(struct muxer_msg_iter *muxer_msg_iter,
                const bt_clock_class *clock_class)
 {
        int ret = 0;
-       const unsigned char *cc_uuid;
+       const uint8_t *cc_uuid;
        const char *cc_name;
 
-       BT_ASSERT(clock_class);
+       BT_ASSERT_DBG(clock_class);
        cc_uuid = bt_clock_class_get_uuid(clock_class);
        cc_name = bt_clock_class_get_name(clock_class);
 
        if (muxer_msg_iter->clock_class_expectation ==
                        MUXER_MSG_ITER_CLOCK_CLASS_EXPECTATION_ANY) {
                /*
-                * This is the first clock class that this muxer
-                * message iterator encounters. Its properties
-                * determine what to expect for the whole lifetime of
-                * the iterator without a true
-                * `assume-absolute-clock-classes` parameter.
+                * This is the first clock class that this muxer message
+                * iterator encounters. Its properties determine what to expect
+                * for the whole lifetime of the iterator.
                 */
                if (bt_clock_class_origin_is_unix_epoch(clock_class)) {
                        /* Expect absolute clock classes */
@@ -684,8 +636,7 @@ int validate_clock_class(struct muxer_msg_iter *muxer_msg_iter,
                                 */
                                muxer_msg_iter->clock_class_expectation =
                                        MUXER_MSG_ITER_CLOCK_CLASS_EXPECTATION_NOT_ABS_SPEC_UUID;
-                               memcpy(muxer_msg_iter->expected_clock_class_uuid,
-                                       cc_uuid, BABELTRACE_UUID_LEN);
+                               bt_uuid_copy(muxer_msg_iter->expected_clock_class_uuid, cc_uuid);
                        } else {
                                /*
                                 * Expect non-absolute clock classes
@@ -697,123 +648,74 @@ int validate_clock_class(struct muxer_msg_iter *muxer_msg_iter,
                }
        }
 
-       if (!muxer_comp->assume_absolute_clock_classes) {
-               switch (muxer_msg_iter->clock_class_expectation) {
-               case MUXER_MSG_ITER_CLOCK_CLASS_EXPECTATION_ABSOLUTE:
-                       if (!bt_clock_class_origin_is_unix_epoch(clock_class)) {
-                               BT_LOGE("Expecting an absolute clock class, "
-                                       "but got a non-absolute one: "
-                                       "clock-class-addr=%p, clock-class-name=\"%s\"",
-                                       clock_class, cc_name);
-                               goto error;
-                       }
-                       break;
-               case MUXER_MSG_ITER_CLOCK_CLASS_EXPECTATION_NOT_ABS_NO_UUID:
-                       if (bt_clock_class_origin_is_unix_epoch(clock_class)) {
-                               BT_LOGE("Expecting a non-absolute clock class with no UUID, "
-                                       "but got an absolute one: "
-                                       "clock-class-addr=%p, clock-class-name=\"%s\"",
-                                       clock_class, cc_name);
-                               goto error;
-                       }
-
-                       if (cc_uuid) {
-                               BT_LOGE("Expecting a non-absolute clock class with no UUID, "
-                                       "but got one with a UUID: "
-                                       "clock-class-addr=%p, clock-class-name=\"%s\", "
-                                       "uuid=\"%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x\"",
-                                       clock_class, cc_name,
-                                       (unsigned int) cc_uuid[0],
-                                       (unsigned int) cc_uuid[1],
-                                       (unsigned int) cc_uuid[2],
-                                       (unsigned int) cc_uuid[3],
-                                       (unsigned int) cc_uuid[4],
-                                       (unsigned int) cc_uuid[5],
-                                       (unsigned int) cc_uuid[6],
-                                       (unsigned int) cc_uuid[7],
-                                       (unsigned int) cc_uuid[8],
-                                       (unsigned int) cc_uuid[9],
-                                       (unsigned int) cc_uuid[10],
-                                       (unsigned int) cc_uuid[11],
-                                       (unsigned int) cc_uuid[12],
-                                       (unsigned int) cc_uuid[13],
-                                       (unsigned int) cc_uuid[14],
-                                       (unsigned int) cc_uuid[15]);
-                               goto error;
-                       }
-                       break;
-               case MUXER_MSG_ITER_CLOCK_CLASS_EXPECTATION_NOT_ABS_SPEC_UUID:
-                       if (bt_clock_class_origin_is_unix_epoch(clock_class)) {
-                               BT_LOGE("Expecting a non-absolute clock class with a specific UUID, "
-                                       "but got an absolute one: "
-                                       "clock-class-addr=%p, clock-class-name=\"%s\"",
-                                       clock_class, cc_name);
-                               goto error;
-                       }
+       switch (muxer_msg_iter->clock_class_expectation) {
+       case MUXER_MSG_ITER_CLOCK_CLASS_EXPECTATION_ABSOLUTE:
+               if (!bt_clock_class_origin_is_unix_epoch(clock_class)) {
+                       BT_COMP_LOGE("Expecting an absolute clock class, "
+                               "but got a non-absolute one: "
+                               "clock-class-addr=%p, clock-class-name=\"%s\"",
+                               clock_class, cc_name);
+                       goto error;
+               }
+               break;
+       case MUXER_MSG_ITER_CLOCK_CLASS_EXPECTATION_NOT_ABS_NO_UUID:
+               if (bt_clock_class_origin_is_unix_epoch(clock_class)) {
+                       BT_COMP_LOGE("Expecting a non-absolute clock class with no UUID, "
+                               "but got an absolute one: "
+                               "clock-class-addr=%p, clock-class-name=\"%s\"",
+                               clock_class, cc_name);
+                       goto error;
+               }
 
-                       if (!cc_uuid) {
-                               BT_LOGE("Expecting a non-absolute clock class with a specific UUID, "
-                                       "but got one with no UUID: "
-                                       "clock-class-addr=%p, clock-class-name=\"%s\"",
-                                       clock_class, cc_name);
-                               goto error;
-                       }
+               if (cc_uuid) {
+                       BT_COMP_LOGE("Expecting a non-absolute clock class with no UUID, "
+                               "but got one with a UUID: "
+                               "clock-class-addr=%p, clock-class-name=\"%s\", "
+                               "uuid=\"" BT_UUID_FMT "\"",
+                               clock_class, cc_name, BT_UUID_FMT_VALUES(cc_uuid));
+                       goto error;
+               }
+               break;
+       case MUXER_MSG_ITER_CLOCK_CLASS_EXPECTATION_NOT_ABS_SPEC_UUID:
+               if (bt_clock_class_origin_is_unix_epoch(clock_class)) {
+                       BT_COMP_LOGE("Expecting a non-absolute clock class with a specific UUID, "
+                               "but got an absolute one: "
+                               "clock-class-addr=%p, clock-class-name=\"%s\"",
+                               clock_class, cc_name);
+                       goto error;
+               }
 
-                       if (memcmp(muxer_msg_iter->expected_clock_class_uuid,
-                                       cc_uuid, BABELTRACE_UUID_LEN) != 0) {
-                               BT_LOGE("Expecting a non-absolute clock class with a specific UUID, "
-                                       "but got one with different UUID: "
-                                       "clock-class-addr=%p, clock-class-name=\"%s\", "
-                                       "expected-uuid=\"%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x\", "
-                                       "uuid=\"%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x\"",
-                                       clock_class, cc_name,
-                                       (unsigned int) muxer_msg_iter->expected_clock_class_uuid[0],
-                                       (unsigned int) muxer_msg_iter->expected_clock_class_uuid[1],
-                                       (unsigned int) muxer_msg_iter->expected_clock_class_uuid[2],
-                                       (unsigned int) muxer_msg_iter->expected_clock_class_uuid[3],
-                                       (unsigned int) muxer_msg_iter->expected_clock_class_uuid[4],
-                                       (unsigned int) muxer_msg_iter->expected_clock_class_uuid[5],
-                                       (unsigned int) muxer_msg_iter->expected_clock_class_uuid[6],
-                                       (unsigned int) muxer_msg_iter->expected_clock_class_uuid[7],
-                                       (unsigned int) muxer_msg_iter->expected_clock_class_uuid[8],
-                                       (unsigned int) muxer_msg_iter->expected_clock_class_uuid[9],
-                                       (unsigned int) muxer_msg_iter->expected_clock_class_uuid[10],
-                                       (unsigned int) muxer_msg_iter->expected_clock_class_uuid[11],
-                                       (unsigned int) muxer_msg_iter->expected_clock_class_uuid[12],
-                                       (unsigned int) muxer_msg_iter->expected_clock_class_uuid[13],
-                                       (unsigned int) muxer_msg_iter->expected_clock_class_uuid[14],
-                                       (unsigned int) muxer_msg_iter->expected_clock_class_uuid[15],
-                                       (unsigned int) cc_uuid[0],
-                                       (unsigned int) cc_uuid[1],
-                                       (unsigned int) cc_uuid[2],
-                                       (unsigned int) cc_uuid[3],
-                                       (unsigned int) cc_uuid[4],
-                                       (unsigned int) cc_uuid[5],
-                                       (unsigned int) cc_uuid[6],
-                                       (unsigned int) cc_uuid[7],
-                                       (unsigned int) cc_uuid[8],
-                                       (unsigned int) cc_uuid[9],
-                                       (unsigned int) cc_uuid[10],
-                                       (unsigned int) cc_uuid[11],
-                                       (unsigned int) cc_uuid[12],
-                                       (unsigned int) cc_uuid[13],
-                                       (unsigned int) cc_uuid[14],
-                                       (unsigned int) cc_uuid[15]);
-                               goto error;
-                       }
-                       break;
-               case MUXER_MSG_ITER_CLOCK_CLASS_EXPECTATION_NONE:
-                       BT_LOGE("Expecting no clock class, but got one: "
+               if (!cc_uuid) {
+                       BT_COMP_LOGE("Expecting a non-absolute clock class with a specific UUID, "
+                               "but got one with no UUID: "
                                "clock-class-addr=%p, clock-class-name=\"%s\"",
                                clock_class, cc_name);
                        goto error;
-               default:
-                       /* Unexpected */
-                       BT_LOGF("Unexpected clock class expectation: "
-                               "expectation-code=%d",
-                               muxer_msg_iter->clock_class_expectation);
-                       abort();
                }
+
+               if (bt_uuid_compare(muxer_msg_iter->expected_clock_class_uuid, cc_uuid) != 0) {
+                       BT_COMP_LOGE("Expecting a non-absolute clock class with a specific UUID, "
+                               "but got one with different UUID: "
+                               "clock-class-addr=%p, clock-class-name=\"%s\", "
+                               "expected-uuid=\"" BT_UUID_FMT "\", "
+                               "uuid=\"" BT_UUID_FMT "\"",
+                               clock_class, cc_name,
+                               BT_UUID_FMT_VALUES(muxer_msg_iter->expected_clock_class_uuid),
+                               BT_UUID_FMT_VALUES(cc_uuid));
+                       goto error;
+               }
+               break;
+       case MUXER_MSG_ITER_CLOCK_CLASS_EXPECTATION_NONE:
+               BT_COMP_LOGE("Expecting no clock class, but got one: "
+                       "clock-class-addr=%p, clock-class-name=\"%s\"",
+                       clock_class, cc_name);
+               goto error;
+       default:
+               /* Unexpected */
+               BT_COMP_LOGF("Unexpected clock class expectation: "
+                       "expectation-code=%d",
+                       muxer_msg_iter->clock_class_expectation);
+               bt_common_abort();
        }
 
        goto end;
@@ -841,8 +743,9 @@ int validate_new_stream_clock_class(struct muxer_msg_iter *muxer_msg_iter,
                        /* Expect no clock class */
                        muxer_msg_iter->clock_class_expectation =
                                MUXER_MSG_ITER_CLOCK_CLASS_EXPECTATION_NONE;
-               } else {
-                       BT_LOGE("Expecting stream class with a default clock class: "
+               } else if (muxer_msg_iter->clock_class_expectation !=
+                               MUXER_MSG_ITER_CLOCK_CLASS_EXPECTATION_NONE) {
+                       BT_COMP_LOGE("Expecting stream class without a default clock class: "
                                "stream-class-addr=%p, stream-class-name=\"%s\", "
                                "stream-class-id=%" PRIu64,
                                stream_class, bt_stream_class_get_name(stream_class),
@@ -876,7 +779,7 @@ end:
  * the youngest, and sets *ts_ns to its time.
  */
 static
-bt_self_message_iterator_status
+bt_message_iterator_class_next_method_status
 muxer_msg_iter_youngest_upstream_msg_iter(
                struct muxer_comp *muxer_comp,
                struct muxer_msg_iter *muxer_msg_iter,
@@ -886,12 +789,12 @@ muxer_msg_iter_youngest_upstream_msg_iter(
        size_t i;
        int ret;
        int64_t youngest_ts_ns = INT64_MAX;
-       bt_self_message_iterator_status status =
-               BT_SELF_MESSAGE_ITERATOR_STATUS_OK;
+       bt_message_iterator_class_next_method_status status =
+               BT_MESSAGE_ITERATOR_CLASS_NEXT_METHOD_STATUS_OK;
 
-       BT_ASSERT(muxer_comp);
-       BT_ASSERT(muxer_msg_iter);
-       BT_ASSERT(muxer_upstream_msg_iter);
+       BT_ASSERT_DBG(muxer_comp);
+       BT_ASSERT_DBG(muxer_msg_iter);
+       BT_ASSERT_DBG(muxer_upstream_msg_iter);
        *muxer_upstream_msg_iter = NULL;
 
        for (i = 0; i < muxer_msg_iter->active_muxer_upstream_msg_iters->len;
@@ -905,15 +808,15 @@ muxer_msg_iter_youngest_upstream_msg_iter(
 
                if (!cur_muxer_upstream_msg_iter->msg_iter) {
                        /* This upstream message iterator is ended */
-                       BT_LOGV("Skipping ended upstream message iterator: "
+                       BT_COMP_LOGT("Skipping ended upstream message iterator: "
                                "muxer-upstream-msg-iter-wrap-addr=%p",
                                cur_muxer_upstream_msg_iter);
                        continue;
                }
 
-               BT_ASSERT(cur_muxer_upstream_msg_iter->msgs->length > 0);
+               BT_ASSERT_DBG(cur_muxer_upstream_msg_iter->msgs->length > 0);
                msg = g_queue_peek_head(cur_muxer_upstream_msg_iter->msgs);
-               BT_ASSERT(msg);
+               BT_ASSERT_DBG(msg);
 
                if (G_UNLIKELY(bt_message_get_type(msg) ==
                                BT_MESSAGE_TYPE_STREAM_BEGINNING)) {
@@ -926,20 +829,20 @@ muxer_msg_iter_youngest_upstream_msg_iter(
                                 * validate_new_stream_clock_class() logs
                                 * errors.
                                 */
-                               status = BT_SELF_MESSAGE_ITERATOR_STATUS_ERROR;
+                               status = BT_MESSAGE_ITERATOR_CLASS_NEXT_METHOD_STATUS_ERROR;
                                goto end;
                        }
                } else if (G_UNLIKELY(bt_message_get_type(msg) ==
                                BT_MESSAGE_TYPE_MESSAGE_ITERATOR_INACTIVITY)) {
                        const bt_clock_snapshot *cs;
 
-                       cs = bt_message_message_iterator_inactivity_borrow_default_clock_snapshot_const(
+                       cs = bt_message_message_iterator_inactivity_borrow_clock_snapshot_const(
                                msg);
                        ret = validate_clock_class(muxer_msg_iter, muxer_comp,
                                bt_clock_snapshot_borrow_clock_class_const(cs));
                        if (ret) {
                                /* validate_clock_class() logs errors */
-                               status = BT_SELF_MESSAGE_ITERATOR_STATUS_ERROR;
+                               status = BT_MESSAGE_ITERATOR_CLASS_NEXT_METHOD_STATUS_ERROR;
                                goto end;
                        }
                }
@@ -949,20 +852,59 @@ muxer_msg_iter_youngest_upstream_msg_iter(
                if (ret) {
                        /* get_msg_ts_ns() logs errors */
                        *muxer_upstream_msg_iter = NULL;
-                       status = BT_SELF_MESSAGE_ITERATOR_STATUS_ERROR;
+                       status = BT_MESSAGE_ITERATOR_CLASS_NEXT_METHOD_STATUS_ERROR;
                        goto end;
                }
 
-               if (msg_ts_ns <= youngest_ts_ns) {
+               /*
+                * Update the current message iterator if it has not been set
+                * yet, or if its current message has a timestamp smaller than
+                * the previously selected youngest message.
+                */
+               if (G_UNLIKELY(*muxer_upstream_msg_iter == NULL) ||
+                               msg_ts_ns < youngest_ts_ns) {
                        *muxer_upstream_msg_iter =
                                cur_muxer_upstream_msg_iter;
                        youngest_ts_ns = msg_ts_ns;
                        *ts_ns = youngest_ts_ns;
+               } else if (msg_ts_ns == youngest_ts_ns) {
+                       /*
+                        * The currently selected message to be sent downstream
+                        * next has the exact same timestamp that of the
+                        * current candidate message. We must break the tie
+                        * in a predictable manner.
+                        */
+                       const bt_message *selected_msg = g_queue_peek_head(
+                               (*muxer_upstream_msg_iter)->msgs);
+                       BT_COMP_LOGD_STR("Two of the next message candidates have the same timestamps, pick one deterministically.");
+
+                       /*
+                        * Order the messages in an arbitrary but determinitic
+                        * way.
+                        */
+                       ret = common_muxing_compare_messages(msg, selected_msg);
+                       if (ret < 0) {
+                               /*
+                                * The `msg` should go first. Update the next
+                                * iterator and the current timestamp.
+                                */
+                               *muxer_upstream_msg_iter =
+                                       cur_muxer_upstream_msg_iter;
+                               youngest_ts_ns = msg_ts_ns;
+                               *ts_ns = youngest_ts_ns;
+                       } else if (ret == 0) {
+                               /* Unable to pick which one should go first. */
+                               BT_COMP_LOGW("Cannot deterministically pick next upstream message iterator because they have identical next messages: "
+                                       "muxer-upstream-msg-iter-wrap-addr=%p"
+                                       "cur-muxer-upstream-msg-iter-wrap-addr=%p",
+                                       *muxer_upstream_msg_iter,
+                                       cur_muxer_upstream_msg_iter);
+                       }
                }
        }
 
        if (!*muxer_upstream_msg_iter) {
-               status = BT_SELF_MESSAGE_ITERATOR_STATUS_END;
+               status = BT_MESSAGE_ITERATOR_CLASS_NEXT_METHOD_STATUS_END;
                *ts_ns = INT64_MIN;
        }
 
@@ -971,23 +913,25 @@ end:
 }
 
 static
-bt_self_message_iterator_status validate_muxer_upstream_msg_iter(
+bt_message_iterator_class_next_method_status
+validate_muxer_upstream_msg_iter(
        struct muxer_upstream_msg_iter *muxer_upstream_msg_iter,
        bool *is_ended)
 {
-       bt_self_message_iterator_status status =
-               BT_SELF_MESSAGE_ITERATOR_STATUS_OK;
+       struct muxer_comp *muxer_comp = muxer_upstream_msg_iter->muxer_comp;
+       bt_message_iterator_class_next_method_status status;
 
-       BT_LOGV("Validating muxer's upstream message iterator wrapper: "
+       BT_COMP_LOGD("Validating muxer's upstream message iterator wrapper: "
                "muxer-upstream-msg-iter-wrap-addr=%p",
                muxer_upstream_msg_iter);
 
        if (muxer_upstream_msg_iter->msgs->length > 0 ||
                        !muxer_upstream_msg_iter->msg_iter) {
-               BT_LOGV("Already valid or not considered: "
+               BT_COMP_LOGD("Already valid or not considered: "
                        "queue-len=%u, upstream-msg-iter-addr=%p",
                        muxer_upstream_msg_iter->msgs->length,
                        muxer_upstream_msg_iter->msg_iter);
+               status = BT_MESSAGE_ITERATOR_CLASS_NEXT_METHOD_STATUS_OK;
                goto end;
        }
 
@@ -1000,14 +944,15 @@ end:
 }
 
 static
-bt_self_message_iterator_status validate_muxer_upstream_msg_iters(
+bt_message_iterator_class_next_method_status
+validate_muxer_upstream_msg_iters(
                struct muxer_msg_iter *muxer_msg_iter)
 {
-       bt_self_message_iterator_status status =
-               BT_SELF_MESSAGE_ITERATOR_STATUS_OK;
+       struct muxer_comp *muxer_comp = muxer_msg_iter->muxer_comp;
+       bt_message_iterator_class_next_method_status status;
        size_t i;
 
-       BT_LOGV("Validating muxer's upstream message iterator wrappers: "
+       BT_COMP_LOGD("Validating muxer's upstream message iterator wrappers: "
                "muxer-msg-iter-addr=%p", muxer_msg_iter);
 
        for (i = 0; i < muxer_msg_iter->active_muxer_upstream_msg_iters->len;
@@ -1020,15 +965,16 @@ bt_self_message_iterator_status validate_muxer_upstream_msg_iters(
 
                status = validate_muxer_upstream_msg_iter(
                        muxer_upstream_msg_iter, &is_ended);
-               if (status != BT_SELF_MESSAGE_ITERATOR_STATUS_OK) {
+               if (status != BT_MESSAGE_ITERATOR_CLASS_NEXT_METHOD_STATUS_OK) {
                        if (status < 0) {
-                               BT_LOGE("Cannot validate muxer's upstream message iterator wrapper: "
+                               BT_COMP_LOGE_APPEND_CAUSE(muxer_comp->self_comp,
+                                       "Cannot validate muxer's upstream message iterator wrapper: "
                                        "muxer-msg-iter-addr=%p, "
                                        "muxer-upstream-msg-iter-wrap-addr=%p",
                                        muxer_msg_iter,
                                        muxer_upstream_msg_iter);
                        } else {
-                               BT_LOGV("Cannot validate muxer's upstream message iterator wrapper: "
+                               BT_COMP_LOGD("Cannot validate muxer's upstream message iterator wrapper: "
                                        "muxer-msg-iter-addr=%p, "
                                        "muxer-upstream-msg-iter-wrap-addr=%p",
                                        muxer_msg_iter,
@@ -1043,7 +989,7 @@ bt_self_message_iterator_status validate_muxer_upstream_msg_iters(
                 * array of ended iterators if it's ended.
                 */
                if (G_UNLIKELY(is_ended)) {
-                       BT_LOGV("Muxer's upstream message iterator wrapper: ended or canceled: "
+                       BT_COMP_LOGD("Muxer's upstream message iterator wrapper: ended or canceled: "
                                "muxer-msg-iter-addr=%p, "
                                "muxer-upstream-msg-iter-wrap-addr=%p",
                                muxer_msg_iter, muxer_upstream_msg_iter);
@@ -1063,22 +1009,25 @@ bt_self_message_iterator_status validate_muxer_upstream_msg_iters(
                }
        }
 
+       status = BT_MESSAGE_ITERATOR_CLASS_NEXT_METHOD_STATUS_OK;
+
 end:
        return status;
 }
 
 static inline
-bt_self_message_iterator_status muxer_msg_iter_do_next_one(
+bt_message_iterator_class_next_method_status muxer_msg_iter_do_next_one(
                struct muxer_comp *muxer_comp,
                struct muxer_msg_iter *muxer_msg_iter,
                const bt_message **msg)
 {
-       bt_self_message_iterator_status status;
+       bt_message_iterator_class_next_method_status status;
        struct muxer_upstream_msg_iter *muxer_upstream_msg_iter = NULL;
-       int64_t next_return_ts;
+       /* Initialize to avoid -Wmaybe-uninitialized warning with gcc 4.8. */
+       int64_t next_return_ts = 0;
 
        status = validate_muxer_upstream_msg_iters(muxer_msg_iter);
-       if (status != BT_SELF_MESSAGE_ITERATOR_STATUS_OK) {
+       if (status != BT_MESSAGE_ITERATOR_CLASS_NEXT_METHOD_STATUS_OK) {
                /* validate_muxer_upstream_msg_iters() logs details */
                goto end;
        }
@@ -1092,44 +1041,47 @@ bt_self_message_iterator_status muxer_msg_iter_do_next_one(
        status = muxer_msg_iter_youngest_upstream_msg_iter(muxer_comp,
                        muxer_msg_iter, &muxer_upstream_msg_iter,
                        &next_return_ts);
-       if (status < 0 || status == BT_SELF_MESSAGE_ITERATOR_STATUS_END) {
+       if (status < 0 || status == BT_MESSAGE_ITERATOR_CLASS_NEXT_METHOD_STATUS_END) {
                if (status < 0) {
-                       BT_LOGE("Cannot find the youngest upstream message iterator wrapper: "
+                       BT_COMP_LOGE_APPEND_CAUSE(muxer_comp->self_comp,
+                               "Cannot find the youngest upstream message iterator wrapper: "
                                "status=%s",
-                               bt_common_self_message_iterator_status_string(status));
+                               bt_common_func_status_string(status));
                } else {
-                       BT_LOGV("Cannot find the youngest upstream message iterator wrapper: "
+                       BT_COMP_LOGD("Cannot find the youngest upstream message iterator wrapper: "
                                "status=%s",
-                               bt_common_self_message_iterator_status_string(status));
+                               bt_common_func_status_string(status));
                }
 
                goto end;
        }
 
        if (next_return_ts < muxer_msg_iter->last_returned_ts_ns) {
-               BT_LOGE("Youngest upstream message iterator wrapper's timestamp is less than muxer's message iterator's last returned timestamp: "
+               BT_COMP_LOGE_APPEND_CAUSE(muxer_comp->self_comp,
+                       "Youngest upstream message iterator wrapper's timestamp is less than muxer's message iterator's last returned timestamp: "
                        "muxer-msg-iter-addr=%p, ts=%" PRId64 ", "
                        "last-returned-ts=%" PRId64,
                        muxer_msg_iter, next_return_ts,
                        muxer_msg_iter->last_returned_ts_ns);
-               status = BT_SELF_MESSAGE_ITERATOR_STATUS_ERROR;
+               status = BT_MESSAGE_ITERATOR_CLASS_NEXT_METHOD_STATUS_ERROR;
                goto end;
        }
 
-       BT_LOGV("Found youngest upstream message iterator wrapper: "
+       BT_COMP_LOGD("Found youngest upstream message iterator wrapper: "
                "muxer-msg-iter-addr=%p, "
                "muxer-upstream-msg-iter-wrap-addr=%p, "
                "ts=%" PRId64,
                muxer_msg_iter, muxer_upstream_msg_iter, next_return_ts);
-       BT_ASSERT(status == BT_SELF_MESSAGE_ITERATOR_STATUS_OK);
-       BT_ASSERT(muxer_upstream_msg_iter);
+       BT_ASSERT_DBG(status ==
+               BT_MESSAGE_ITERATOR_CLASS_NEXT_METHOD_STATUS_OK);
+       BT_ASSERT_DBG(muxer_upstream_msg_iter);
 
        /*
         * Consume from the queue's head: other side
         * (muxer_upstream_msg_iter_next()) writes to the tail.
         */
        *msg = g_queue_pop_head(muxer_upstream_msg_iter->msgs);
-       BT_ASSERT(*msg);
+       BT_ASSERT_DBG(*msg);
        muxer_msg_iter->last_returned_ts_ns = next_return_ts;
 
 end:
@@ -1137,23 +1089,33 @@ end:
 }
 
 static
-bt_self_message_iterator_status muxer_msg_iter_do_next(
+bt_message_iterator_class_next_method_status muxer_msg_iter_do_next(
                struct muxer_comp *muxer_comp,
                struct muxer_msg_iter *muxer_msg_iter,
                bt_message_array_const msgs, uint64_t capacity,
                uint64_t *count)
 {
-       bt_self_message_iterator_status status =
-               BT_SELF_MESSAGE_ITERATOR_STATUS_OK;
+       bt_message_iterator_class_next_method_status status;
        uint64_t i = 0;
 
-       while (i < capacity && status == BT_SELF_MESSAGE_ITERATOR_STATUS_OK) {
+       if (G_UNLIKELY(muxer_msg_iter->next_saved_error)) {
+               /*
+                * Last time we were called, we hit an error but had some
+                * messages to deliver, so we stashed the error here.  Return
+                * it now.
+                */
+               BT_CURRENT_THREAD_MOVE_ERROR_AND_RESET(muxer_msg_iter->next_saved_error);
+               status = muxer_msg_iter->next_saved_status;
+               goto end;
+       }
+
+       do {
                status = muxer_msg_iter_do_next_one(muxer_comp,
                        muxer_msg_iter, &msgs[i]);
-               if (status == BT_SELF_MESSAGE_ITERATOR_STATUS_OK) {
+               if (status == BT_MESSAGE_ITERATOR_CLASS_NEXT_METHOD_STATUS_OK) {
                        i++;
                }
-       }
+       } while (i < capacity && status == BT_MESSAGE_ITERATOR_CLASS_NEXT_METHOD_STATUS_OK);
 
        if (i > 0) {
                /*
@@ -1168,31 +1130,47 @@ bt_self_message_iterator_status muxer_msg_iter_do_next(
                 * called, possibly without any accumulated
                 * message, in which case we'll return it.
                 */
+               if (status < 0) {
+                       /*
+                        * Save this error for the next _next call.  Assume that
+                        * this component always appends error causes when
+                        * returning an error status code, which will cause the
+                        * current thread error to be non-NULL.
+                        */
+                       muxer_msg_iter->next_saved_error = bt_current_thread_take_error();
+                       BT_ASSERT(muxer_msg_iter->next_saved_error);
+                       muxer_msg_iter->next_saved_status = status;
+               }
+
                *count = i;
-               status = BT_SELF_MESSAGE_ITERATOR_STATUS_OK;
+               status = BT_MESSAGE_ITERATOR_CLASS_NEXT_METHOD_STATUS_OK;
        }
 
+end:
        return status;
 }
 
 static
 void destroy_muxer_msg_iter(struct muxer_msg_iter *muxer_msg_iter)
 {
+       struct muxer_comp *muxer_comp;
+
        if (!muxer_msg_iter) {
                return;
        }
 
-       BT_LOGD("Destroying muxer component's message iterator: "
+       muxer_comp = muxer_msg_iter->muxer_comp;
+       BT_COMP_LOGD("Destroying muxer component's message iterator: "
                "muxer-msg-iter-addr=%p", muxer_msg_iter);
 
        if (muxer_msg_iter->active_muxer_upstream_msg_iters) {
-               BT_LOGD_STR("Destroying muxer's active upstream message iterator wrappers.");
+               BT_COMP_LOGD_STR("Destroying muxer's active upstream message iterator wrappers.");
                g_ptr_array_free(
                        muxer_msg_iter->active_muxer_upstream_msg_iters, TRUE);
        }
 
        if (muxer_msg_iter->ended_muxer_upstream_msg_iters) {
-               BT_LOGD_STR("Destroying muxer's ended upstream message iterator wrappers.");
+               BT_COMP_LOGD_STR("Destroying muxer's ended upstream message iterator wrappers.");
                g_ptr_array_free(
                        muxer_msg_iter->ended_muxer_upstream_msg_iters, TRUE);
        }
@@ -1201,29 +1179,36 @@ void destroy_muxer_msg_iter(struct muxer_msg_iter *muxer_msg_iter)
 }
 
 static
-int muxer_msg_iter_init_upstream_iterators(struct muxer_comp *muxer_comp,
-               struct muxer_msg_iter *muxer_msg_iter)
+bt_message_iterator_class_initialize_method_status
+muxer_msg_iter_init_upstream_iterators(struct muxer_comp *muxer_comp,
+               struct muxer_msg_iter *muxer_msg_iter,
+               struct bt_self_message_iterator_configuration *config)
 {
        int64_t count;
        int64_t i;
-       int ret = 0;
+       bt_message_iterator_class_initialize_method_status status;
+       bool can_seek_forward = true;
 
        count = bt_component_filter_get_input_port_count(
                bt_self_component_filter_as_component_filter(
-                       muxer_comp->self_comp));
+                       muxer_comp->self_comp_flt));
        if (count < 0) {
-               BT_LOGD("No input port to initialize for muxer component's message iterator: "
+               BT_COMP_LOGD("No input port to initialize for muxer component's message iterator: "
                        "muxer-comp-addr=%p, muxer-msg-iter-addr=%p",
                        muxer_comp, muxer_msg_iter);
+               status = BT_MESSAGE_ITERATOR_CLASS_INITIALIZE_METHOD_STATUS_OK;
                goto end;
        }
 
        for (i = 0; i < count; i++) {
-               bt_self_component_port_input_message_iterator *upstream_msg_iter;
+               bt_message_iterator *upstream_msg_iter;
                bt_self_component_port_input *self_port =
                        bt_self_component_filter_borrow_input_port_by_index(
-                               muxer_comp->self_comp, i);
+                               muxer_comp->self_comp_flt, i);
                const bt_port *port;
+               bt_message_iterator_create_from_message_iterator_status
+                       msg_iter_status;
+               int int_status;
 
                BT_ASSERT(self_port);
                port = bt_self_component_port_as_port(
@@ -1236,44 +1221,57 @@ int muxer_msg_iter_init_upstream_iterators(struct muxer_comp *muxer_comp,
                        continue;
                }
 
-               upstream_msg_iter = create_msg_iter_on_input_port(self_port);
-               if (!upstream_msg_iter) {
+               msg_iter_status = create_msg_iter_on_input_port(muxer_comp,
+                       muxer_msg_iter, self_port, &upstream_msg_iter);
+               if (msg_iter_status != BT_MESSAGE_ITERATOR_CREATE_FROM_MESSAGE_ITERATOR_STATUS_OK) {
                        /* create_msg_iter_on_input_port() logs errors */
-                       BT_ASSERT(!upstream_msg_iter);
-                       ret = -1;
+                       status = (int) msg_iter_status;
                        goto end;
                }
 
-               ret = muxer_msg_iter_add_upstream_msg_iter(muxer_msg_iter,
+               int_status = muxer_msg_iter_add_upstream_msg_iter(muxer_msg_iter,
                        upstream_msg_iter);
-               bt_self_component_port_input_message_iterator_put_ref(
+               bt_message_iterator_put_ref(
                        upstream_msg_iter);
-               if (ret) {
+               if (int_status) {
+                       status = BT_MESSAGE_ITERATOR_CLASS_INITIALIZE_METHOD_STATUS_ERROR;
                        /* muxer_msg_iter_add_upstream_msg_iter() logs errors */
                        goto end;
                }
+
+               can_seek_forward = can_seek_forward &&
+                       bt_message_iterator_can_seek_forward(
+                               upstream_msg_iter);
        }
 
+       /*
+        * This iterator can seek forward if all of its iterators can seek
+        * forward.
+        */
+       bt_self_message_iterator_configuration_set_can_seek_forward(
+               config, can_seek_forward);
+
+       status = BT_MESSAGE_ITERATOR_CLASS_INITIALIZE_METHOD_STATUS_OK;
+
 end:
-       return ret;
+       return status;
 }
 
 BT_HIDDEN
-bt_self_message_iterator_status muxer_msg_iter_init(
+bt_message_iterator_class_initialize_method_status muxer_msg_iter_init(
                bt_self_message_iterator *self_msg_iter,
-               bt_self_component_filter *self_comp,
+               bt_self_message_iterator_configuration *config,
                bt_self_component_port_output *port)
 {
        struct muxer_comp *muxer_comp = NULL;
        struct muxer_msg_iter *muxer_msg_iter = NULL;
-       bt_self_message_iterator_status status =
-               BT_SELF_MESSAGE_ITERATOR_STATUS_OK;
-       int ret;
+       bt_message_iterator_class_initialize_method_status status;
+       bt_self_component *self_comp =
+               bt_self_message_iterator_borrow_component(self_msg_iter);
 
-       muxer_comp = bt_self_component_get_data(
-               bt_self_component_filter_as_self_component(self_comp));
+       muxer_comp = bt_self_component_get_data(self_comp);
        BT_ASSERT(muxer_comp);
-       BT_LOGD("Initializing muxer component's message iterator: "
+       BT_COMP_LOGD("Initializing muxer component's message iterator: "
                "comp-addr=%p, muxer-comp-addr=%p, msg-iter-addr=%p",
                self_comp, muxer_comp, self_msg_iter);
 
@@ -1283,25 +1281,30 @@ bt_self_message_iterator_status muxer_msg_iter_init(
                 * creates a muxer message iterator while creating
                 * another muxer message iterator (same component).
                 */
-               BT_LOGE("Recursive initialization of muxer component's message iterator: "
+               BT_COMP_LOGE("Recursive initialization of muxer component's message iterator: "
                        "comp-addr=%p, muxer-comp-addr=%p, msg-iter-addr=%p",
                        self_comp, muxer_comp, self_msg_iter);
+               status = BT_MESSAGE_ITERATOR_CLASS_INITIALIZE_METHOD_STATUS_ERROR;
                goto error;
        }
 
        muxer_comp->initializing_muxer_msg_iter = true;
        muxer_msg_iter = g_new0(struct muxer_msg_iter, 1);
        if (!muxer_msg_iter) {
-               BT_LOGE_STR("Failed to allocate one muxer component's message iterator.");
+               BT_COMP_LOGE_STR("Failed to allocate one muxer component's message iterator.");
+               status = BT_MESSAGE_ITERATOR_CLASS_INITIALIZE_METHOD_STATUS_MEMORY_ERROR;
                goto error;
        }
 
+       muxer_msg_iter->muxer_comp = muxer_comp;
+       muxer_msg_iter->self_msg_iter = self_msg_iter;
        muxer_msg_iter->last_returned_ts_ns = INT64_MIN;
        muxer_msg_iter->active_muxer_upstream_msg_iters =
                g_ptr_array_new_with_free_func(
                        (GDestroyNotify) destroy_muxer_upstream_msg_iter);
        if (!muxer_msg_iter->active_muxer_upstream_msg_iters) {
-               BT_LOGE_STR("Failed to allocate a GPtrArray.");
+               BT_COMP_LOGE_STR("Failed to allocate a GPtrArray.");
+               status = BT_MESSAGE_ITERATOR_CLASS_INITIALIZE_METHOD_STATUS_MEMORY_ERROR;
                goto error;
        }
 
@@ -1309,23 +1312,24 @@ bt_self_message_iterator_status muxer_msg_iter_init(
                g_ptr_array_new_with_free_func(
                        (GDestroyNotify) destroy_muxer_upstream_msg_iter);
        if (!muxer_msg_iter->ended_muxer_upstream_msg_iters) {
-               BT_LOGE_STR("Failed to allocate a GPtrArray.");
+               BT_COMP_LOGE_STR("Failed to allocate a GPtrArray.");
+               status = BT_MESSAGE_ITERATOR_CLASS_INITIALIZE_METHOD_STATUS_MEMORY_ERROR;
                goto error;
        }
 
-       ret = muxer_msg_iter_init_upstream_iterators(muxer_comp,
-               muxer_msg_iter);
-       if (ret) {
-               BT_LOGE("Cannot initialize connected input ports for muxer component's message iterator: "
+       status = muxer_msg_iter_init_upstream_iterators(muxer_comp,
+               muxer_msg_iter, config);
+       if (status) {
+               BT_COMP_LOGE("Cannot initialize connected input ports for muxer component's message iterator: "
                        "comp-addr=%p, muxer-comp-addr=%p, "
                        "muxer-msg-iter-addr=%p, msg-iter-addr=%p, ret=%d",
                        self_comp, muxer_comp, muxer_msg_iter,
-                       self_msg_iter, ret);
+                       self_msg_iter, status);
                goto error;
        }
 
        bt_self_message_iterator_set_data(self_msg_iter, muxer_msg_iter);
-       BT_LOGD("Initialized muxer component's message iterator: "
+       BT_COMP_LOGD("Initialized muxer component's message iterator: "
                "comp-addr=%p, muxer-comp-addr=%p, muxer-msg-iter-addr=%p, "
                "msg-iter-addr=%p",
                self_comp, muxer_comp, muxer_msg_iter, self_msg_iter);
@@ -1334,7 +1338,6 @@ bt_self_message_iterator_status muxer_msg_iter_init(
 error:
        destroy_muxer_msg_iter(muxer_msg_iter);
        bt_self_message_iterator_set_data(self_msg_iter, NULL);
-       status = BT_SELF_MESSAGE_ITERATOR_STATUS_ERROR;
 
 end:
        muxer_comp->initializing_muxer_msg_iter = false;
@@ -1353,7 +1356,7 @@ void muxer_msg_iter_finalize(bt_self_message_iterator *self_msg_iter)
                self_msg_iter);
        BT_ASSERT(self_comp);
        muxer_comp = bt_self_component_get_data(self_comp);
-       BT_LOGD("Finalizing muxer component's message iterator: "
+       BT_COMP_LOGD("Finalizing muxer component's message iterator: "
                "comp-addr=%p, muxer-comp-addr=%p, muxer-msg-iter-addr=%p, "
                "msg-iter-addr=%p",
                self_comp, muxer_comp, muxer_msg_iter, self_msg_iter);
@@ -1364,24 +1367,24 @@ void muxer_msg_iter_finalize(bt_self_message_iterator *self_msg_iter)
 }
 
 BT_HIDDEN
-bt_self_message_iterator_status muxer_msg_iter_next(
+bt_message_iterator_class_next_method_status muxer_msg_iter_next(
                bt_self_message_iterator *self_msg_iter,
                bt_message_array_const msgs, uint64_t capacity,
                uint64_t *count)
 {
-       bt_self_message_iterator_status status;
+       bt_message_iterator_class_next_method_status status;
        struct muxer_msg_iter *muxer_msg_iter =
                bt_self_message_iterator_get_data(self_msg_iter);
        bt_self_component *self_comp = NULL;
        struct muxer_comp *muxer_comp = NULL;
 
-       BT_ASSERT(muxer_msg_iter);
+       BT_ASSERT_DBG(muxer_msg_iter);
        self_comp = bt_self_message_iterator_borrow_component(
                self_msg_iter);
-       BT_ASSERT(self_comp);
+       BT_ASSERT_DBG(self_comp);
        muxer_comp = bt_self_component_get_data(self_comp);
-       BT_ASSERT(muxer_comp);
-       BT_LOGV("Muxer component's message iterator's \"next\" method called: "
+       BT_ASSERT_DBG(muxer_comp);
+       BT_COMP_LOGT("Muxer component's message iterator's \"next\" method called: "
                "comp-addr=%p, muxer-comp-addr=%p, muxer-msg-iter-addr=%p, "
                "msg-iter-addr=%p",
                self_comp, muxer_comp, muxer_msg_iter, self_msg_iter);
@@ -1389,37 +1392,45 @@ bt_self_message_iterator_status muxer_msg_iter_next(
        status = muxer_msg_iter_do_next(muxer_comp, muxer_msg_iter,
                msgs, capacity, count);
        if (status < 0) {
-               BT_LOGE("Cannot get next message: "
+               BT_COMP_LOGE("Cannot get next message: "
                        "comp-addr=%p, muxer-comp-addr=%p, muxer-msg-iter-addr=%p, "
                        "msg-iter-addr=%p, status=%s",
                        self_comp, muxer_comp, muxer_msg_iter, self_msg_iter,
-                       bt_common_self_message_iterator_status_string(status));
+                       bt_common_func_status_string(status));
        } else {
-               BT_LOGV("Returning from muxer component's message iterator's \"next\" method: "
+               BT_COMP_LOGT("Returning from muxer component's message iterator's \"next\" method: "
                        "status=%s",
-                       bt_common_self_message_iterator_status_string(status));
+                       bt_common_func_status_string(status));
        }
 
        return status;
 }
 
 BT_HIDDEN
-bt_self_component_status muxer_input_port_connected(
+bt_component_class_port_connected_method_status muxer_input_port_connected(
                bt_self_component_filter *self_comp,
                bt_self_component_port_input *self_port,
                const bt_port_output *other_port)
 {
-       bt_self_component_status status;
+       bt_component_class_port_connected_method_status status =
+               BT_COMPONENT_CLASS_PORT_CONNECTED_METHOD_STATUS_OK;
+       bt_self_component_add_port_status add_port_status;
+       struct muxer_comp *muxer_comp = bt_self_component_get_data(
+               bt_self_component_filter_as_self_component(self_comp));
 
-       status = add_available_input_port(self_comp);
-       if (status) {
-               /*
-                * Only way to report an error later since this
-                * method does not return anything.
-                */
-               BT_LOGE("Cannot add one muxer component's input port: "
+       add_port_status = add_available_input_port(self_comp);
+       if (add_port_status) {
+               BT_COMP_LOGE("Cannot add one muxer component's input port: "
                        "status=%s",
-                       bt_self_component_status_string(status));
+                       bt_common_func_status_string(status));
+
+               if (add_port_status ==
+                               BT_SELF_COMPONENT_ADD_PORT_STATUS_MEMORY_ERROR) {
+                       status = BT_COMPONENT_CLASS_PORT_CONNECTED_METHOD_STATUS_MEMORY_ERROR;
+               } else {
+                       status = BT_COMPONENT_CLASS_PORT_CONNECTED_METHOD_STATUS_ERROR;
+               }
+
                goto end;
        }
 
@@ -1428,58 +1439,69 @@ end:
 }
 
 static inline
-bt_bool muxer_upstream_msg_iters_can_all_seek_beginning(
-               GPtrArray *muxer_upstream_msg_iters)
+bt_message_iterator_class_can_seek_beginning_method_status
+muxer_upstream_msg_iters_can_all_seek_beginning(
+               GPtrArray *muxer_upstream_msg_iters, bt_bool *can_seek)
 {
+       bt_message_iterator_class_can_seek_beginning_method_status status =
+               BT_MESSAGE_ITERATOR_CLASS_CAN_SEEK_BEGINNING_METHOD_STATUS_OK;
        uint64_t i;
-       bt_bool ret = BT_TRUE;
 
        for (i = 0; i < muxer_upstream_msg_iters->len; i++) {
                struct muxer_upstream_msg_iter *upstream_msg_iter =
                        muxer_upstream_msg_iters->pdata[i];
+               status = (int) bt_message_iterator_can_seek_beginning(
+                       upstream_msg_iter->msg_iter, can_seek);
+               if (status != BT_MESSAGE_ITERATOR_CLASS_CAN_SEEK_BEGINNING_METHOD_STATUS_OK) {
+                       goto end;
+               }
 
-               if (!bt_self_component_port_input_message_iterator_can_seek_beginning(
-                               upstream_msg_iter->msg_iter)) {
-                       ret = BT_FALSE;
+               if (!*can_seek) {
                        goto end;
                }
        }
 
+       *can_seek = BT_TRUE;
+
 end:
-       return ret;
+       return status;
 }
 
 BT_HIDDEN
-bt_bool muxer_msg_iter_can_seek_beginning(
-               bt_self_message_iterator *self_msg_iter)
+bt_message_iterator_class_can_seek_beginning_method_status
+muxer_msg_iter_can_seek_beginning(
+               bt_self_message_iterator *self_msg_iter, bt_bool *can_seek)
 {
        struct muxer_msg_iter *muxer_msg_iter =
                bt_self_message_iterator_get_data(self_msg_iter);
-       bt_bool ret = BT_TRUE;
+       bt_message_iterator_class_can_seek_beginning_method_status status;
 
-       if (!muxer_upstream_msg_iters_can_all_seek_beginning(
-                       muxer_msg_iter->active_muxer_upstream_msg_iters)) {
-               ret = BT_FALSE;
+       status = muxer_upstream_msg_iters_can_all_seek_beginning(
+               muxer_msg_iter->active_muxer_upstream_msg_iters, can_seek);
+       if (status != BT_MESSAGE_ITERATOR_CLASS_CAN_SEEK_BEGINNING_METHOD_STATUS_OK) {
                goto end;
        }
 
-       if (!muxer_upstream_msg_iters_can_all_seek_beginning(
-                       muxer_msg_iter->ended_muxer_upstream_msg_iters)) {
-               ret = BT_FALSE;
+       if (!*can_seek) {
                goto end;
        }
 
+       status = muxer_upstream_msg_iters_can_all_seek_beginning(
+               muxer_msg_iter->ended_muxer_upstream_msg_iters, can_seek);
+
 end:
-       return ret;
+       return status;
 }
 
 BT_HIDDEN
-bt_self_message_iterator_status muxer_msg_iter_seek_beginning(
+bt_message_iterator_class_seek_beginning_method_status muxer_msg_iter_seek_beginning(
                bt_self_message_iterator *self_msg_iter)
 {
        struct muxer_msg_iter *muxer_msg_iter =
                bt_self_message_iterator_get_data(self_msg_iter);
-       bt_message_iterator_status status = BT_MESSAGE_ITERATOR_STATUS_OK;
+       bt_message_iterator_class_seek_beginning_method_status status =
+               BT_MESSAGE_ITERATOR_CLASS_SEEK_BEGINNING_METHOD_STATUS_OK;
+       bt_message_iterator_seek_beginning_status seek_beg_status;
        uint64_t i;
 
        /* Seek all ended upstream iterators first */
@@ -1488,9 +1510,10 @@ bt_self_message_iterator_status muxer_msg_iter_seek_beginning(
                struct muxer_upstream_msg_iter *upstream_msg_iter =
                        muxer_msg_iter->ended_muxer_upstream_msg_iters->pdata[i];
 
-               status = bt_self_component_port_input_message_iterator_seek_beginning(
+               seek_beg_status = bt_message_iterator_seek_beginning(
                        upstream_msg_iter->msg_iter);
-               if (status != BT_MESSAGE_ITERATOR_STATUS_OK) {
+               if (seek_beg_status != BT_MESSAGE_ITERATOR_SEEK_BEGINNING_STATUS_OK) {
+                       status = (int) seek_beg_status;
                        goto end;
                }
 
@@ -1503,9 +1526,10 @@ bt_self_message_iterator_status muxer_msg_iter_seek_beginning(
                struct muxer_upstream_msg_iter *upstream_msg_iter =
                        muxer_msg_iter->active_muxer_upstream_msg_iters->pdata[i];
 
-               status = bt_self_component_port_input_message_iterator_seek_beginning(
+               seek_beg_status = bt_message_iterator_seek_beginning(
                        upstream_msg_iter->msg_iter);
-               if (status != BT_MESSAGE_ITERATOR_STATUS_OK) {
+               if (seek_beg_status != BT_MESSAGE_ITERATOR_SEEK_BEGINNING_STATUS_OK) {
+                       status = (int) seek_beg_status;
                        goto end;
                }
 
@@ -1523,12 +1547,18 @@ bt_self_message_iterator_status muxer_msg_iter_seek_beginning(
                muxer_msg_iter->ended_muxer_upstream_msg_iters->pdata[i] = NULL;
        }
 
-       g_ptr_array_remove_range(muxer_msg_iter->ended_muxer_upstream_msg_iters,
-               0, muxer_msg_iter->ended_muxer_upstream_msg_iters->len);
+       /*
+        * GLib < 2.48.0 asserts when g_ptr_array_remove_range() is
+        * called on an empty array.
+        */
+       if (muxer_msg_iter->ended_muxer_upstream_msg_iters->len > 0) {
+               g_ptr_array_remove_range(muxer_msg_iter->ended_muxer_upstream_msg_iters,
+                       0, muxer_msg_iter->ended_muxer_upstream_msg_iters->len);
+       }
        muxer_msg_iter->last_returned_ts_ns = INT64_MIN;
        muxer_msg_iter->clock_class_expectation =
                MUXER_MSG_ITER_CLOCK_CLASS_EXPECTATION_ANY;
 
 end:
-       return (bt_self_message_iterator_status) status;
+       return status;
 }
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